Striped liquid personal cleansing compositions containing a cleansing phase and a separate benefit phase with improved stability

ABSTRACT

Personal cleansing compositions comprise a cleansing phase comprising a surfactant and water; and a separate, substantially anhydrous benefit phase comprising a hydrophobic skin benefit agent. The cleansing phase and the benefit phase have substantially the same density; wherein the personal cleansing composition is in a form selected from the group consisting of liquid, semi-liquid, cream, lotion, gel, and mixtures thereof. The two phases are packaged in physical contact. These compositions and corresponding methods provide improved cosmetics, skin feel, and/or skin benefit efficacy.

CROSS REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No.10/699,469 filed on Oct. 31, 2003 now U.S. Pat. No. 7,511,003, whichclaims the benefit of U.S. Provisional Application No. 60/423,537, filedNov. 4, 2002.

FIELD OF THE INVENTION

The present invention relates to striped liquid personal cleansingcompositions comprising a cleansing phase and a separate benefit phasewherein the two phases are packaged in physical contact with improvedstability.

BACKGROUND OF THE INVENTION

Personal cleansing compositions that attempt to provideskin-conditioning benefits are known. Many of these compositions areaqueous systems comprising an emulsified conditioning oil or othersimilar materials in combination with a lathering surfactant. Althoughthese products provide both conditioning and cleansing benefits, it isoften difficult to formulate a product that deposits sufficient amountof skin conditioning agents on skin during use. In order to combatemulsification of the skin conditioning agents by the cleansingsurfactant, large amounts of the skin conditioning agent are added tothe compositions. However, this introduces another problem associatedwith these dual cleansing and conditioning products. Raising the levelof skin conditioning agent in order to achieve increased depositionnegatively affects product lather performance and stability.

One attempt at providing conditioning and cleansing benefits from apersonal cleansing product while maintaining stability has been the useof dual-chamber packaging. These packages comprise separate cleansingcompositions and conditioning compositions, and allow for theco-dispensing of the two in a single or dual stream. The separateconditioning and cleansing compositions thus remain physically separateand stable during prolonged storage and just prior to application, butthen mix during or after dispensing to provide conditioning andcleansing benefits from a physically stable system. Although suchdual-chamber delivery systems provide improved conditioning benefitsover the use of conventional systems, it is often difficult to achieveconsistent and uniform performance because of the uneven dispensingratio between the cleansing phase and the conditioning phase from thesedual-chamber packages. Additionally, these packaging systems addconsiderable cost to the finished product.

Accordingly, the need still remains for a personal cleansing compositionthat provides both cleansing and improved skin conditioning benefits.The need also remains for a personal cleansing composition comprisingtwo phases in physical contact that remain stable for long periods oftime.

It is therefore an object of the present invention to provide a stripedliquid personal cleansing composition comprising cleansing and benefitphases that are packaged in physical contact while remaining stable,wherein the compositions provide improved deposition of conditioningagents on skin.

It has now been found that a striped liquid personal cleansingcomposition containing both cleansing and benefit phases that arepackaged in physical contact while remaining stable, can be formulatedto provide improved cosmetics and skin feel during and after applicationwhile also providing excellent skin conditioning and cleansing benefits.It has been found that such a composition can be formulated withsufficiently high levels of benefit agents without compromising productlather performance and stability. Superior lather performance can bedemonstrated via the lather volume method described herein.

It has also been found that striped personal cleansing compositions canbe formulated with enhanced stability by density matching of thecleansing phase and the benefit phase and by incorporating densitymodifiers in the cleansing phase and/or the benefit phase.

SUMMARY OF THE INVENTION

The present invention is directed to a striped personal cleansingcomposition comprising first stripe comprising a cleansing phasecomprising a surfactant, water, and optional conventional personalcleansing ingredients and at least one additional stripe comprising aseparate benefit phase containing at least about 20% by weight of ahydrophobic material having a Vaughn Solubility Parameter of from about5 to about 15, wherein the benefit phase has a Consistency Value of fromabout 1 to about 10,000 poise.

The present invention further relates to a striped liquid personalcleansing composition comprising:

-   -   a) a first stripe comprising a cleansing phase comprising from        about 1% to about 50% by weight of the cleansing phase of a        surfactant selected from the group consisting of anionic        surfactant, non-ionic surfactant, zwitterionic surfactant,        cationic surfactant, soap and mixtures thereof;    -   wherein the cleansing phase is non-Newtonian shear thinning, and        has a viscosity of equal to or greater than about 3,000 cps and        a yield value of at least about 0.1 Pa; and    -   b) a benefit phase comprising from about 20% to about 100% by        weight of the benefit phase of a hydrophobic material selected        from the group consisting of lipids, hydrocarbons, fats, oils,        hydrophobic plant extracts, fatty acids, essential oils,        silicone oils, and mixtures thereof;        -   wherein the hydrophobic material has a Vaughan Solubility            Parameter of about 5 to about 15 and further wherein the            weight ratio between the cleansing phase and the benefit            phase is from about 1:9 to about 99:1 and the cleansing            phase and benefit phase are in physical contact in the same            package and remain stable in ambient conditions for at least            about 180 days; and wherein the cleansing phase and benefit            phase are present as stripes wherein the stripe size is at            least about 0.1 mm in width and at least about 1 mm in            length;        -   wherein the cleansing phase and/or the benefit phase            contains a density modifier to match the cleansing phase            density to the benefit phase density.

The present invention further relates to a striped personal cleansingcomposition comprising a cleansing phase and benefit phase wherein atleast one phase contains a colorant, wherein both phases are packed in asingle package such that the two phases form a pattern.

The present invention is also directed to a method of cleansing andmoisturizing the skin by applying to the skin a composition as describedabove. These compositions provide improved deposition of skin benefitagents on skin during application.

DETAILED DESCRIPTION

The striped personal cleansing compositions and methods of the presentinvention comprise personal cleansing compositions comprising a firststripe comprising a cleansing phase and at least one additional stripecomprising a separate benefit phase. These and other essentiallimitations of the compositions and methods of the present invention, aswell as many of the optional ingredients suitable for use herein, aredescribed in detail hereinafter.

The term “anhydrous” as used herein, unless otherwise specified, refersto those compositions or materials containing less than about 10%, morepreferably less than about 5%, even more preferably less than about 3%,even more preferably zero percent, by weight of water.

The term “ambient conditions” as used herein, unless otherwisespecified, refers to surrounding conditions at one (1) atmosphere ofpressure, 50% relative humidity, and 25° C.

The term “stable” as used herein, unless otherwise specified, refers tocompositions that maintain at least two “separate” phases in physicalcontact at ambient conditions for a period of at least about 180 days.By “separate” is meant that there is substantially no mixing, observableto the naked eye, prior to dispensing of the composition.

The term “personal cleansing composition” as used herein, unlessotherwise specified, refers to the compositions of the presentinvention, wherein the compositions are intended to include only thosecompositions for topical application to the skin or hair, andspecifically excludes those compositions that are directed primarily toother applications such as hard surface cleansing, fabric or laundrycleansing, and similar other applications not intended primarily fortopical application to the hair or skin.

The Vaughan Solubility Parameter (VSP) as used herein is a parameterused to define the solubility of lipophilic materials. VaughanSolubility parameters are well known in the various chemical andformulation arts and typically have a range of from 5 to 25.

The term “Consistency” or “k” as used herein is a measure of lipidviscosity and is used in combination with Shear index, to defineviscosity for materials whose viscosity is a function of shear. Themeasurements are made at 35° C. and the units are poise (equal to 100cps).

The term “Shear index” or “n” as used herein is a measure of lipidviscosity and is used in combination with Consistency, to defineviscosity for materials whose viscosity is a function of shear. Themeasurements are made at 35° C. and the units are dimensionless.

The phrase “substantially free of” as used herein, unless otherwisespecified means that the composition comprises less than about 5%,preferably less than about 3%, more preferably less than about 1% andmost preferably less than about 0.1% of the stated ingredient.

The term “a striped” personal cleansing composition as used herein, isone that comprises separate phases that form a pattern that is selectedfrom the group consisting of striped, geometric, marbled and mixturesthereof. Preferably, the stripe size is at least about 0.1 mm in widthand at least 1 mm in length. More preferably, the stripe size is atleast about 0.5 mm in width and at least 10 mm in length. Even morepreferably, the stripe size is at least about 1 mm in width and at least20 mm in length.

All percentages, parts and ratios as used herein are by weight of thetotal composition, unless otherwise specified. All such weights as theypertain to listed ingredients are based on the active level and,therefore, do not include solvents or by-products that may be includedin commercially available materials, unless otherwise specified.

The personal cleansing compositions and methods of the present inventioncan comprise, consist of, or consist essentially of, the essentialelements and limitations of the invention described herein, as well asany additional or optional ingredients, components, or limitationsdescribed herein or otherwise useful in personal cleansing compositionsintended for topical application to the hair or skin.

Product Form

The personal cleansing compositions of the present invention can be inthe form of liquid, semi-liquid, cream, lotion or gel compositionsintended for topical application to skin. These compositions contain acleansing phase and a benefit phase, both of which are described ingreater detail hereinafter.

All of the product forms contemplated for purposes of defining thecompositions and methods of the present invention are rinse-offformulations, by which is meant the product is applied topically to theskin or hair and then subsequently (i.e., within minutes) rinsed awaywith water, or otherwise wiped off using a substrate or other suitableremoval means.

The personal cleansing composition of the present invention preferablyhas a density in the cleaning phase and a density in the benefit phasethat match. Preferably the density matched is about less than 0.15g/cm³, more preferably less than about 0.1 g/cm³, even more preferablyless than 0.05 g/cm³, still even more preferably less than 0.01 g/cm³.

Cleansing Phase

The personal cleansing compositions of the present invention comprise anaqueous cleansing phase that contains a surfactant suitable forapplication to the skin or hair. Suitable surfactants for use hereininclude any known or otherwise effective cleansing surfactant suitablefor application to the skin, and which is otherwise compatible with theother essential ingredients in the aqueous cleansing phase of thecompositions. These cleansing surfactants include anionic, nonionic,cationic, zwitterionic or amphoteric surfactants, or combinationsthereof.

The aqueous cleansing phase of the personal care compositions preferablycomprises a cleansing surfactant at concentrations ranging from about 1%to about 50%, more preferably from about 4% to about 30%, even morepreferably from about 5% to about 25%, by weight of the aqueouscleansing phase. The preferred pH range of the cleansing phase is fromabout 5 to about 8.

Anionic surfactants suitable for use in the cleansing phase includealkyl and alkyl ether sulfates. These materials have the respectiveformula ROSO₃M and RO(C₂H₄O)_(X)SO₃M, wherein R is alkyl or alkenyl offrom about 8 to about 24 carbon atoms, x is 1 to 10, and M is awater-soluble cation such as ammonium, sodium, potassium andtriethanolamine. The alkyl ether sulfates are typically made ascondensation products of ethylene oxide and monohydric alcohols havingfrom about 8 to about 24 carbon atoms. Preferably, R has from about 10to about 18 carbon atoms in both the alkyl and alkyl ether sulfates. Thealcohols can be derived from fats, e.g., coconut oil or tallow, or canbe synthetic. Lauryl alcohol and straight chain alcohols derived fromcoconut oil are preferred herein. Such alcohols are reacted with about 1to about 10, preferably from about 3 to about 5, and more preferablywith about 3, molar pro-portions of ethylene oxide and the resultingmixture of molecular species having, for example, an average of 3 molesof ethylene oxide per mole of alcohol, is sulfated and neutralized.

Specific examples of alkyl ether sulfates which may be used in thecleansing phase are sodium and ammonium salts of coconut alkyltriethylene glycol ether sulfate; tallow alkyl triethylene glycol ethersulfate, and tallow alkyl hexaoxyethylene sulfate. Highly preferredalkyl ether sulfates are those comprising a mixture of individualcompounds, said mixture having an average alkyl chain length of fromabout 10 to about 16 carbon atoms and an average degree of ethoxylationof from about 1 to about 4 moles of ethylene oxide.

Other suitable anionic surfactants include water-soluble salts of theorganic, sulfuric acid reaction products of the general formula[R¹—SO₃-M], wherein R¹ is chosen from the group consisting of a straightor branched chain, saturated aliphatic hydrocarbon radical having fromabout 8 to about 24, preferably about 10 to about 18, carbon atoms; andM is a cation. Suitable examples are the salts of an organic sulfuricacid reaction product of a hydrocarbon of the methane series, includingiso-, neo-, ineso-, and n-paraffins, having about 8 to about 24 carbonatoms, preferably about 10 to about 18 carbon atoms and a sulfonatingagent, e.g., SO₃, H₂SO₄, oleum, obtained according to known sulfonationmethods, including bleaching and hydrolysis. Preferred are alkali metaland ammonium sulfonated C₁₀₋₁₈ n-paraffins.

Other suitable surfactants are described in McCutcheon's, Emulsifiersand Detergents, 1989 Annual, published by M. C. Publishing Co., and inU.S. Pat. No. 3,929,678.

Preferred anionic surfactants for use in the cleansing phase includeammonium lauryl sulfate, ammonium laureth sulfate, triethylamine laurylsulfate, triethylamine laureth sulfate, triethanolamine lauryl sulfate,triethanolamine laureth sulfate, monoethanolamine lauryl sulfate,monoethanolamine laureth sulfate, diethanolamine lauryl sulfate,diethanolamine laureth sulfate, lauric monoglyceride sodium sulfate,sodium lauryl sulfate, sodium laureth sulfate, potassium laurethsulfate, sodium lauryl sarcosinate, sodium lauroyl sarcosinate, laurylsarcosine, cocoyl sarcosine, ammonium cocoyl sulfate, ammonium lauroylsulfate, sodium cocoyl sulfate, sodium lauroyl sulfate, potassium cocoylsulfate, potassium lauryl sulfate, monoethanolamine cocoyl sulfate,sodium tridecyl benzene sulfonate, sodium dodecyl benzene sulfonate, andcombinations thereof.

Anionic surfactants with branched alkyl chains such as sodium tridecethsulfate, for example, are preferred in some embodiments. Mixtures ofanionic surfactants may be used in some embodiments.

Additional surfactant from the classes of amphoteric, zwitterionicsurfactant, cationic surfactant, and/or nonionic surfactant may beincorporated in the cleansing phase compositions.

Amphoteric surfactants suitable for use in the cleansing phase includethose that are broadly described as derivatives of aliphatic secondaryand tertiary amines in which the aliphatic radical can be straight orbranched chain and wherein one of the aliphatic substituents containsfrom about 8 to about 18 carbon atoms and one contains an anionic watersolubilizing group, e.g., carboxy, sulfonate, sulfate, phosphate, orphosphonate. Examples of compounds falling within this definition aresodium 3-dodecyl-aminopropionate, sodium 3-dodecylaminopropanesulfonate, sodium lauryl sarcosinate, N-alkyltaurines such as the oneprepared by reacting dodecylamine with sodium isethionate according tothe teaching of U.S. Pat. No. 2,658,072, N-higher alkyl aspartic acidssuch as those produced according to the teaching of U.S. Pat. No.2,438,091, and the products described in U.S. Pat. No. 2,528,378.

Zwitterionic surfactants suitable for use in the cleansing phase includethose that are broadly described as derivatives of aliphatic quaternaryammonium, phosphonium, and sulfonium compounds, in which the aliphaticradicals can be straight or branched chain, and wherein one of thealiphatic substituents contains from about 8 to about 18 carbon atomsand one contains an anionic group, e.g., carboxy, sulfonate, sulfate,phosphate, or phosphonate. Such suitable zwitterionic surfactants can berepresented by the formula:

wherein R² contains an alkyl, alkenyl, or hydroxy alkyl radical of fromabout 8 to about 18 carbon atoms, from 0 to about 10 ethylene oxidemoieties and from 0 to about 1 glyceryl moiety; Y is selected from thegroup consisting of nitrogen, phosphorus, and sulfur atoms; R³ is analkyl or monohydroxyalkyl group containing about 1 to about 3 carbonatoms; X is 1 when Y is a sulfur atom, and 2 when Y is a nitrogen orphosphorus atom; R⁴ is an alkylene or hydroxyalkylene of from about 1 toabout 4 carbon atoms and Z is a radical selected from the groupconsisting of carboxylate, sulfonate, sulfate, phosphonate, andphosphate groups.

Other zwitterionic surfactants suitable for use in the cleansing phaseinclude betaines, including high alkyl betaines such as coco dimethylcarboxymethyl betaine, cocoamidopropyl betaine, cocobetaine, laurylamidopropyl betaine, oleyl betaine, lauryl dimethyl carboxymethylbetaine, lauryl dimethyl alphacarboxyethyl betaine, cetyl dimethylcarboxymethyl betaine, lauryl bis-(2-hydroxyethyl)carboxymethyl betaine,stearyl bis-(2-hydroxypropyl)carboxymethyl betaine, oleyl dimethylgamma-carboxypropyl betaine, and laurylbis-(2-hydroxypropyl)alpha-carboxyethyl betaine. The sulfobetaines maybe represented by coco dimethyl sulfopropyl betaine, stearyl dimethylsulfopropyl betaine, lauryl dimethyl sulfoethyl betaine, laurylbis-(2-hydroxyethyl)sulfopropyl betaine and the like; amidobetaines andamidosulfobetaines, wherein the RCONH(CH₂)₃ radical is attached to thenitrogen atom of the betaine are also useful in this invention.

Amphoacetates and diamphoacetates may also be used.

Amphoacetates and diamphoacetates conform to the formulas (above) whereR is an aliphatic group of 8 to 18 carbon atoms. M is a cation such assodium, potassium, ammonium, or substituted ammonium. Sodiumlauroamphoacetate, sodium cocoamphoactetate, disodium lauroamphoacetate,and disodium cocodiamphoacetate are preferred in some embodiments.

Cationic surfactants can also be used in the cleansing phase, but aregenerally less preferred, and preferably represent less than about 5% byweight of the compositions.

Suitable nonionic surfactants for use in the aqueous cleansing phaseinclude condensation products of alkylene oxide groups (hydrophilic innature) with an organic hydrophobic compound, which may be aliphatic oralkyl aromatic in nature.

Stability Enhancers

Density Modifiers

To further improve stability under stress conditions such as hightemperature and vibration, it is preferable to adjust the densities ofthe separate phases such that they are substantially equal. To achievethis, low density microspheres are added to the cleansing phase of thestriped composition. The low density microspheres employed to reduce theoverall density of the cleansing phase are particles having a densitylower than 0.7 g/cm³, preferably less than 0.2 g/cm³, more preferablyless than 0.1 g/cm³, most preferably less than 0.05 g/cm³. The lowdensity microspheres generally have a diameter less than 200 μm,preferably less than 100 μm, most preferably less than 40 μm.Preferably, the density difference between the cleansing phase and thebenefit phase is less than 0.15 g/cm³, more preferably, the densitydifference is less than 0.10 g/cm³, even more preferably, the densitydifference is less than 0.05 g/cm³, most preferably, the densitydifference is less than 0.01 g/cm³.

The microspheres are produced from any appropriate inorganic or organicmaterial, compatible with a use on the skin, that is, nonirritating andnontoxic. Preferably, the microspheres don't negatively impact theproduct lather performance.

Expanded microspheres made of thermoplastic material are known, and maybe obtained, for example, according to the processes described inPatents and Patent Applications EP-56219, EP-348372, EP-486080,EP-320473, EP-1 12807 and U.S. Pat. No. 3,615,972.

These microspheres may be produced from any nontoxic and non-irritantthermoplastic materials. Polymers or copolymers of acrylonitrile or ofvinylidene chloride may be used, for example. It is possible to use, forexample, a copolymer containing, by weight, from 0 to 60% of unitsderived from vinylidene chloride, from 20 to 90% of units derived fromacrylonitrile and from 0 to 50% of units derived from an acrylic orstyrene monomer, the sum of the percentages (by weight) being equal to100. The acrylic monomer is, for example, a methyl or ethyl acrylate ormethacrylate. The styrene monomer is, for example, alpha-methylstyreneor styrene. These microspheres can be in the dry or hydrated state.

The internal cavity of expanded hollow microspheres contains a gas,which can be a hydrocarbon such as isobutane or isopentane oralternatively air. Among hollow microspheres which can be used, specialmention may be made of those marketed under the brand name EXPANCEL®(thermoplastic expandable microspheres) by the Akzo Nobel Company,especially those of DE (dry state) or WE (hydrated state) grade.Examples include: Expancel® 091 DE 40 d30; Expancel® 091 DE 80 d30;Expancel® 051 DE 40 d60; Expancel® 091 WE 40 d24; Expancel® 053 DE 40d20.

Representative microspheres derived from an inorganic material, include,for instance, “Qcel® Hollow Microspheres” and “EXTENDOSPHERES™ CeramicHollow Spheres”, both available from the PQ Corporation. Examples are:Qcel® 300; Qcel® 6019; Qcel® 6042S.

Just as low density microspheres can be added to the cleansing phase ofthe present invention to improve vibrational stability, high densitymaterials can be added to the benefit phase to increase its densityhaving the same impact on stability.

Optional Ingredients for use in the Cleansing Phase

Other suitable optional ingredients in the cleansing phase are one ormore humectants and solutes. A variety of humectants and solutes can beemployed and can be present at a level of from about 0.1% to about 50%,preferably from about 0.5% to about 35%, and more preferably from about2% to about 20% of a non-volatile, organic material having a solubilityof a least 5 parts in 10 parts water. A preferred water soluble, organicmaterial is selected from the group consisting of a polyol of thestructure:R1-O(CH₂—CR2HO)_(n)Hwhere R1=H, C1-C4 alkyl; R2=H, CH₃ and n=1-200; C2-C10 alkane diols;guanidine; glycolic acid and glycolate salts (e.g. ammonium andquaternary alkyl ammonium); lactic acid and lactate salts (e.g. ammoniumand quaternary alkyl ammonium); polyhydroxy alcohols such as sorbitol,glycerol, hexanetriol, propylene glycol, hexylene glycol and the like;polyethylene glycol; sugars and starches; sugar and starch derivatives(e.g. alkoxylated glucose); panthenol (including D-, L-, and the D,L-forms); pyrrolidone carboxylic acid; hyaluronic acid; lactamidemonoethanolamine; acetamide monoethanolamine; urea; and ethanol aminesof the general structure (HOCH₂CH₂)_(x)NH_(y) where x=1-3; y=0-2, andx+y=3, and mixtures thereof. The most preferred polyols are selectedfrom the group consisting of glycerine, polyoxypropylene(1) glycerol andpolyoxypropylene(3) glycerol, sorbitol, butylene glycol, propyleneglycol, sucrose, urea and triethanol amine.

Nonionic polyethylene/polypropylene glycol polymers are preferably usedas skin conditioning agents. Polymers useful herein that are especiallypreferred are PEG-2M wherein x equals 2 and n has an average value ofabout 2,000 (PEG 2-M is also known as Polyox WSR® N-10 from UnionCarbide and as PEG-2,000); PEG-5M wherein x equals 2 and n has anaverage value of about 5,000 (PEG 5-M is also known as Polyox WSR® 35and Polyox WSR® N-80, both from Union Carbide and as PEG-5,000 andPolyethylene Glycol 200,000); PEG-7M wherein x equals 2 and n has anaverage value of about 7,000 (PEG 7-M is also known as Polyox WSR®(N-750 from Union Carbide); PEG-9M wherein x equals 2 and n has anaverage value of about 9,000 (PEG 9-M is also known as Polyox WSR®N-3333 from Union Carbide); PEG-14 M wherein x equals 2 and n has anaverage value of about 14,000 (PEG 14-M is also known as Polyox WSR-205and Polyox WSR® N-3000 both from Union Carbide); and PEG-90M wherein xequals 2 and n has an average value of about 90,000 (PEG-90M is alsoknown as Polyox WSR®-301 from Union Carbide.)

Other non limiting examples of these optional ingredients includevitamins and derivatives thereof (e.g., ascorbic acid, vitamin E,tocopheryl acetate, and the like); sunscreens; thickening agents (e.g.,polyol alkoxy ester, available as Crothix from Croda); preservatives formaintaining the anti microbial integrity of the cleansing compositions;anti-acne medicaments (resorcinol, salicylic acid, and the like);antioxidants; skin soothing and healing agents such as aloe veraextract, allantoin and the like; chelators and sequestrants; and agentssuitable for aesthetic purposes such as fragrances, essential oils, skinsensates, pigments, pearlescent agents (e.g., mica and titaniumdioxide), lakes, colorings, and the like (e.g., clove oil, menthol,camphor, eucalyptus oil, and eugenol).

Non limiting examples of suitable carboxylic copolymers, emulsifiers,emollients, and other additional ingredients are disclosed in U.S. Pat.No., 5,011,681, to Ciotti et al., issued Apr. 30, 1991.

Without wishing to be bound by theory, it is believed that in someexamples the compositions of the invention may have a lamellarstructure. The compositions of the invention have free-flowingNon-Newtonian shear-thinning properties and the ability to suspendcomponents (which are known characteristics of lamellar phase surfactantcompositions).

In another preferred embodiment of the present invention the surfactantcompositions for use in the cleansing phase exhibiting Non-Newtonianshear thinning behavior (herein referred to as free flowingcompositions). These surfactant compositions comprise water, at leastone anionic surfactant, an electrolyte and at least one alkanolamide. Ithas been found that by employing a cleansing phase exhibitingNon-Newtonian shear thinning behavior, the stability of the resultingpersonal cleansing composition may be increased. The alkanolamide ifpresent has the general structure of:

wherein R is C₈ to C₂₄ or preferably in some embodiments C₈ to C₂₂ or inother embodiments C₈ to C_(18 saturated) or unsaturated straight chainor branched aliphatic group, R₁ and R₂ are the same or different C₂-C₄straight chain or branched aliphatic group, x=0 to 10; y=1-10 andwherein the sum of x and y is less than or equal to 10.

The amount of alkanolamide in the composition is typically about 0.1% toabout 10% by weight, and in some embodiments is preferably about 2% toabout 5% by weight of the cleansing phase. Some preferred alkanolamidesinclude Cocamide MEA (Coco monethanolamide) and Cocamide MIPA (Cocomonoisopropranolamide).

The electrolyte, if used, can be added per se to the composition or itcan be formed in situ via the counter-ions included in one of the rawmaterials. The electrolyte preferably includes an anion comprisingphosphate, chloride, sulfate or citrate and a cation comprising sodium,ammonium, potassium, magnesium or mixtures thereof. Some preferredelectrolytes are sodium or ammonium chloride or sodium or ammoniumsulfate.

The electrolyte, when present, should be present in an amount, whichfacilitates formation of the free flowing composition. Generally, thisamount is from about 0.1% by weight to about 15% by weight, preferablyfrom about 1% to about 6% by weight of the cleansing phase, but may bevaried if required.

Frequently surfactants are sold as solutions in water or other solventswhich dilute them to less than 100% active surfactant, therefore the“active surfactant” means actual amount of surfactant delivered to thefree flowing composition from a commercial surfactant preparation.

The total amount of all surfactants e.g. anionic surfactants, nonionicsurfactants, amphoteric and/or zwitterionic surfactants, and cationicsurfactants taken together, is typically about 8 to about 30% activesurfactant and preferably about 10 to about 20% active surfactant. Insome embodiments it is preferable that at least one of the surfactantshas an aliphatic chain that has branching or unsaturation or acombination thereof.

Viscosity of Cleansing Phase Composition

The Wells-Brookfield Cone/Plate Model DV-II+ can be used to determinethe viscosity of the personal cleansing composition described herein.The determination is performed at 25° C. with 2.4 cm 3° cone measuringsystem with a gap of 0.013 mm between the two small pins on therespective cone and plate. The measurement is performed by injecting 0.5ml. of the sample to be analyzed between the cone and the plate andtoting the cone at a set speed of 1 rpm. The resistance to rotation ofthe cone produces a torque that is proportional to the shear stress ofthe liquid sample. The amount of torque is read and computed by theviscometer into absolute centipoises units (cps) based on geometricconstant of the cone, the rate of rotation, and the stress relatedtorque.

Preferably, the cleansing phase has a viscosity of greater than 3,000cps. More preferably, the viscosity is greater than 5,000 cps. Even morepreferably, the viscosity is greater than 10,000 cps. Most preferably,the viscosity is greater than 20,000 cps.

Yield Point of Cleansing Phase Composition

The Carrimed CSL 100 Controlled Stress Rheometer can be used todetermine the yield point of the personal cleansing compositiondescribed herein. For purposes herein, the yield point is the amount ofstress required to produce a strain of 1% on the personal cleansingcomposition. The determination is performed at 25° C. with the 4 cm 2°cone measuring system set with a 51 micron gap. The determination isperformed via the programmed application of shear stress (typically fromabout 0.06 dynes/sq. centimeter to about 500 dynes/sq. centimeter) overtime. This amount of stress results in a deformation of the sample. Ashear stress versus strain curve can be created. From this curve, theyield point of the personal cleansing composition can be calculated.

Preferably, the cleansing phase has a yield point of greater than 0.1Pascal. More preferably, the yield point is greater than 1 Pascal. Evenmore preferably, the yield point is greater than 10 Pascal. Mostpreferably, the yield point is greater than 30 Pascal.

Benefit Phase

The separate benefit phase in the present invention is preferablyanhydrous. The benefit phase comprises from about 20% to about 100%,preferably at least about 35%, most preferably at least about 50% of ahydrophobic skin benefit agent. The benefit agents suitable for use inthe present invention have a Vaughan Solubility Parameter of from about5 to about 15. The benefit agents are preferably selected among thosehaving defined Theological properties as described hereinafter,including selected Consistency (k) and Shear Index (n). These preferredTheological properties are especially useful in providing the personalcleansing compositions with improved deposition of benefit agents onskin.

Vaughan Solubility Parameter Value (VSP)

The hydrophobic skin benefit agent for use in the benefit phase of thecomposition has a Vaughan Solubility Parameter (VSP) of from about 5 toabout 15, preferably from about 6 to less than 10, more preferably fromabout 6 to about 9. These solubility parameters are well known in theformulation arts, and are defined by Vaughan in Cosmetics andToiletries, Vol. 103, p 47-69, October 1988.

Non-limiting examples of hydrophobic skin benefit agent having VSPvalues ranging from about 5 to about 15 include the following:

VAUGHAN SOLUBILITY PARAMETERS* Cyclomethicone 5.92 Squalene 6.03Petrolatum 7.33 Isopropyl Palmitate 7.78 Isopropyl Myristate 8.02 CastorOil 8.90 Cholesterol 9.55 *As reported in Solubility, Effects inProduct, Package, Penetration and Preservation, C. D. Vaughan, Cosmeticsand Toiletries, Vol. 103, October 1988.

B) Rheology

The hydrophobic skin benefit agents for use in the benefit phase of thecomposition have a preferred rheology profile as defined by Consistency(k) and Shear Index (n). Preferred Consistency ranges are 1-10,000 poise(1/sec)^(n-1), preferably 10-2000 poise (1/sec)^(n-1) and morepreferably 50-1000 poise (1/sec)^(n-1). Shear Index ranges are 0.1-0.8,preferably 0.1-0.5 and more preferably 0.20-0.4.

The hydrophobic skin benefit agents can be characterized by Consistency(k) and Shear Index (n) values as defined by the above-described ranges,wherein these defined ranges are selected to provide enhanced depositionand reduced stickiness during and after application of the personalcleaning composition on hair or skin.

The Shear index (n) and Consistency (k) values are well known andaccepted industry standards for reporting the viscosity profile ofmaterials having a viscosity that is a function of an applied shearrate.

The viscosity (μ) for any material can be characterized by therelationship or equation[μ=σ/γ′]wherein σ is shear stress and γ′ is shear rate, so that the viscosityfor any material can be measured by either applying a shear rate andmeasuring the resultant shear stress or vice versa.

The Carrimed CSL 100 Controlled Stress Rheometer is used to determineShear Index, n, and Consistency, k, for the hydrophobic skin benefitagents herein. The determination is performed at 35° C. with the 4 cm 2°cone measuring system typically set with a 51 micron gap and isperformed via the programmed application of a shear stress (typicallyfrom about 0.06 dynes/sq. cm to about 5,000 dynes/sq. cm) over time. Ifthis stress results in a deformation of the sample, i.e. strain of themeasuring geometry of at least 10-4 rad/sec, then this rate of strain isreported as a shear rate. These data are used to create a viscosity (μ)versus shear rate (γ′) flow curve for the hydrophobic skin benefit agentmaterial. This flow curve can then be modeled in order to provide amathematical expression that describes the material's behavior withinspecific limits of shear stress and shear rate. These results are fittedwith the following well-accepted power law model (see for instance:Chemical Engineering, by Coulson and Richardson, Pergamon, 1982 orTransport Phenomena by Bird, Stewart and Lightfoot, Wiley, 1960):[μ=k(γ′)^(n-1)]

The Carrimed CSL 100 Controlled Stress Rheometer is used to performoscillatory tests at 35° C. with the 4 cm 2° cone measuring systemtypically set with a 51 micron gap. The oscillatory tests at 35° C. arecarried out in 2 steps. The first step is a stress amplitude sweep atthe expected starting and ending frequencies for the frequency sweep.These tests allow a determination to be made as to whether or not thetest conditions are within the linear viscoelastic region for the testmaterial over the anticipated frequency range. The linear viscoelasticregion is a region where there is a linear relationship between stressand strain. The second step is a frequency sweep made at a stress levelwithin that linear viscoelastic region. The frequency sweep allows thetest material's viscoelastic behavior to be measured. The oscillatorytest on a controlled stress rheometer is performed by applying a stressin an oscillatory manner and measuring the resulting oscillatory strainresponse and the phase shift between the applied stress wave form andthe resulting strain wave form in the test material. The resultingcomplex modulus is expressed as a combination of the material's elastic(G′) and viscous (G″) components. The elastic modulus G′ is a measure ofa materials ability to store recoverable energy. This energy storage canbe the result of the ability of a complex polymer, structural network,or a combination of these to recover stored energy after a deformation.The viscous or loss modulus G″ is a measure of the unrecoverable energy,which has been lost due to viscous flow.

The hydrophobic skin benefit agents suitable for use herein can includea variety of hydrocarbons, oils and waxes, silicones, fatty acidderivatives, cholesterol, cholesterol derivatives, diglycerides,triglycerides, vegetable oils, vegetable oil derivatives, acetoglycerideesters, alkyl esters, alkenyl esters, lanolin and its derivatives, waxesters, beeswax derivatives, sterols and phospholipids, and combinationsthereof.

Non-limiting examples of hydrocarbon oils and waxes suitable for useherein include petrolatum, mineral oil, micro-crystalline waxes,polyalkenes, paraffins, cerasin, ozokerite, polyethylene,perhydrosqualene, and combinations thereof.

Non-limiting examples of silicone oils suitable for use as hydrophobicskin benefit agents herein include dimethicone copolyol,dimethylpolysiloxane, diethylpolysiloxane, mixed C1-C30 alkylpolysiloxanes, phenyl dimethicone, dimethiconol, and combinationsthereof. Preferred are non-volatile silicones selected from dimethicone,dimethiconol, mixed C1-C30 alkyl polysiloxane, and combinations thereof.Nonlimiting examples of silicone oils useful herein are described inU.S. Pat. No. 5,011,681 (Ciotti et al.).

Non-limiting examples of diglycerides and triglycerides suitable for useas hydrophobic skin benefit agents herein include castor oil, soy beanoil, derivatized soybean oils such as maleated soy bean oil, saffloweroil, cotton seed oil, corn oil, walnut oil, peanut oil, olive oil, codliver oil, almond oil, avocado oil, palm oil and sesame oil, vegetableoils, sunflower seed oil, and vegetable oil derivatives; coconut oil andderivatized coconut oil, cottonseed oil and derivatized cottonseed oil,jojoba oil, cocoa butter, and combinations thereof.

Non-limiting examples of acetoglyceride esters suitable for use ashydrophobic skin benefit agents herein include acetylatedmonoglycerides.

Non-limiting examples of alkyl esters suitable for use as hydrophobicskin benefit agents herein include isopropyl esters of fatty acids andlong chain esters of long chain (i.e. C₁₀-C₂₄) fatty acids, e.g. cetylricinoleate, non-limiting examples of which incloude isopropylpalmitate, isopropyl myristate, cetyl riconoleate and stearylriconoleate. Other examples are: hexyl laurate, isohexyl laurate,myristyl myristate, isohexyl palmitate, decyl oleate, isodecyl oleate,hexadecyl stearate, decyl stearate, isopropyl isostearate, diisopropyladipate, diisohexyl adipate, dihexyldecyl adipate, diisopropyl sebacate,acyl isononanoate lauryl lactate, myristyl lactate, cetyl lactate, andcombinations thereof.

Non-limiting examples of alkenyl esters suitable for use as hydrophobicskin benefit agents herein include oleyl myristate, oleyl stearate,oleyl oleate, and combinations thereof.

Non-limiting examples of lanolin and lanolin derivatives suitable foruse as hydrophobic skin benefit agents herein include lanolin, lanolinoil, lanolin wax, lanolin alcohols, lanolin fatty acids, isopropyllanolate, acetylated lanolin, acetylated lanolin alcohols, lanolinalcohol linoleate, lanolin alcohol riconoleate, and combinationsthereof.

Still other suitable hydrophobic skin benefit agents include milktriglycerides (e.g., hydroxylated milk glyceride) and polyol fatty acidpolyesters.

Still other suitable hydrophobic skin benefit agents include wax esters,non-limiting examples of which include beeswax and beeswax derivatives,spermaceti, myristyl myristate, stearyl stearate, and combinationsthereof. Also useful are vegetable waxes such as carnauba and candelillawaxes; sterols such as cholesterol, cholesterol fatty acid esters; andphospholipids such as lecithin and derivatives, sphingo lipids,ceramides, glycosphingo lipids, and combinations thereof.

The benefit phase of the composition preferably comprises one or morehydrophobic skin benefit agents, wherein at least 20% by weight of thehydrophobic skin benefit agents are selected from petrolatum, mineraloil, sunflower seed oil, micro-crystalline waxes, paraffins, ozokerite,polyethylene, polybutene, polydecene and perhydrosqualene dimethicones,cyclomethicones, alkyl siloxanes, polymethylsiloxanes andmethylphenylpolysiloxanes, lanolin, lanolin oil, lanolin wax, lanolinalcohols, lanolin fatty acids, isopropyl lanolate, acetylated lanolin,acetylated lanolin alcohols, lanolin alcohol linoleate, lanolin alcoholriconoleate, castor oil, soy bean oil, maleated soy bean oil, saffloweroil, cotton seed oil, corn oil, walnut oil, peanut oil, olive oil, codliver oil, almond oil, avocado oil, palm oil and sesame oil, andcombinations thereof. More preferably, at least about 50% by weight ofthe lipophilic skin conditioning agents are selected from the groups ofpetrolatum, mineral oil, paraffins, polyethylene, polybutene,polydecene, dimethicones, alkyl siloxanes, cyclomethicones, lanolin,lanolin oil, lanolin wax. The remainder of the lipophilic skinconditioning agent is preferably selected from: isopropyl palmitate,cetyl riconoleate, octyl isononanoate, octyl palmitate, isocetylstearate, hydroxylated milk glyceride and combinations thereof.

Stability Enhancers

Structurants

The benefit phase of the striped personal cleansing composition cancomprise a structurant, which improves the high temperature stability ofthe composition. Preferred structurants suitable that can be used in thepresent invention include those structurants that are immiscible in theaqueous cleansing phase and may take the form of a wax, hydrophobicsilica, hydrophobic clay, polymer or mixtures thereof. In one embodimentof the present invention, the structurant can comprise a crystalline,hydroxyl-containing stabilizer. Tri-hydroxystearin is most preferred.Tri hydroxystearin is available commercially as Thixcin R from Rheox andas Flowtone from Southern Clay Products.

Additionally, the structurant can comprise hydrophobically modifieddispersed amorphous silica. As used herein the term “dispersed amorphoussilica” refers to small, finely divided non-crystalline silica having amean agglomerate particle size of less than about 100 microns.

Fumed silica, is produced by the vapor phase hydrolysis of silicontetrachloride in a hydrogen oxygen flame. It is believed that thecombustion process creates silicone dioxide molecules which condense toform particles.

The particles collide, attach and sinter together. The result of thisprocess is a three dimensional branched chain aggregate. Once theaggregate cools below the fusion point of silica, which is about 1710°C., further collisions result in mechanical entanglement of the chainsto form agglomerates. Precipitated silicas and silica gels are generallymade in aqueous solution. See, Cabot Technical Data Pamphlet TD-100entitled “CAB-O-SIL@ Untreated Fumed Silica Properties and Functions”,October 1993, and Cabot Technical Data Pamphlet TD-104 entitled“CAB-O-SIL@ Fumed Silica in Cosmetic and Personal Care Products”, March1992.

The fumed silica preferably has a mean agglomerate particle size rangingfrom about 0.1 microns to about 100 microns, more preferably from about1 micron to about 50 microns, and more preferably still from about 10microns to about 30 microns. The agglomerates are composed of aggregateswhich have a mean particle size ranging from about 0.01 microns to about15 microns, preferably from about 0.05 microns to about 10 microns, morepreferably from about 0.1 microns to about 5 microns and more preferablystill from about 0.2 microns to about 0.3 microns. The silica preferablyhas a surface area greater than 50 sq. m/gram, more preferably greaterthan about 130 sq. m/gram, and more preferably still greater than about180 sq. m./gram.

The fumed silica is hydrophobically modified via the addition ofnon-polar moieties to the surface of the silica. Exemplaryhydrophobically modified fumed silicas for use in the present inventioninclude, but are not limited to, silica dimethyl silylate whereby thesurface of the fumed silica has been modified with dimethyl silyl groupsavailable commercially as Aerosil R972 and Aerosil R974 both availablefrom Degussa; and CAB-O-SIL TS-610 and CAB-O-SIL TS-720 both availablefrom Cabot- and silica silylate whereby the surface of the fumed silicahas been modified with trimethylsiloxyl groups available commercially asAerosil R812 and Sipernat D17 both available from Degussa- and CAB SILTS-530 available from Cabot.

Additionally, the structurant can comprise hydrophobically modifieddispersed smectite clay selected from the group consisting of bentonite,hectorite and mixtures thereof. Bentonite is a colloidal aluminum claysulfate. See Merck Index, Eleventh Edition, 1989, entry 1062, p. 164.Hectorite is a clay containing sodium, magnesium, lithium, silicon,oxygen, hydrogen and fluorine. See Merck Index, Eleventh Edition, 1989,entry 4538, p. 729.

Hyrophobically modified dispersed smectite clays are called organoclaysand are formed by reacting monoquatemary compounds with the smectiteclays to form an organoclay complex. Non-limiting examples oforganoclays for use in the present invention include dihydrogenatedtallow benzylmonium hectorite available commercially as Bentone SD-3from Rheox; quaternium-18 hectorite available commercially as Bentoneand in mixtures M-P-A 14, Bentone Gel DOA, Bentone Gel ECO 5, BentoneGel EUG, Bentone Gel IPP, Bentone Gel ISD, Bentone Gel MIO, Bentone GelMIO-A40, Bentone Gel SS-71, Bentone Gel 10ST, Bentone Gel VS-5, BentoneGel VS-8, Bentone Gel VS-38, Bentone Gel VS-5PC, and Bentone Gel YVS allavailable from Rheox, quaternium-18 bentonite available commercially asBentone 34 from Rheox and Claytone 40 and Claytone SO from SouthernClay-quatemium-18/benzalkonium bentonite available commercially asClaytone HT from Southern Clay-stearalkonium bentonite availablecommercially as Claytone AF from Southern Clay, Toxogel LG and TixogelVZ from United Catalysts, and Viscogel B7 from Bentec- and stearalkoniumhectorite available commercially as Bentone 27 from Rheox and inmixtures Bentone Gel CAO, Bentone Gel IPM, Bentone Gel LOI, Bentone GelM-20, Bentone Gel RSS, Bentone Gel SIL, and Bentone Gel TN, all fromRheox.

The structurant can also comprise the use of metal soaps, homopolymers,ionic homo- and copolymers and block copolymers. Some common gellingagents which can be used in the present invention include fatty acidsoaps of lithium, calcium, sodium, aluminum, zinc and barium. A numberof homo- and copolymers can also be used including atacticethylene-propylene. Homopolymers or copolymers which have pendant saltgroups also form ion rich aggregates in a non-polar matrix. The ionicinteraction and resultant polymer properties of these compositions,however, are dependent on the type of polymer backbone, type of ionicmoiety and type of cation. Sulfonated polystyrenes exemplify this kindof system. Block systems used in the present invention includestyrene-isoprene, styrene-butadiene and styrene ethylene oxidecopolymers.

Commercially available thermoplastic rubber type polymers are especiallyuseful as structurants in the benefit phase. They are sold under thetrademark Kraton® by Shell Chemical Company. The Kraton® rubber polymersare described as elastomers which have an unusual combination of highstrength and low viscosity and a unique molecular structure of lineardiblock, triblock and radial polymers. Each molecule of the Kraton®rubber is said to consist of block segments of styrene monomer units andrubber monomer units. Each block segment may consist of 100 monomerunits or more. The most common structure is the linear ABA block type;styrene-butadiene-styrene (SBS) and styrene-isoprene-styrene (SIS), theKraton® D rubber series. A second generation polymer of this series isthe Kraton® G series which are styrene-ethylene-butylene-styrene type(S-EB-S) polymers. Diblock polymers include the ABA type and the SB,styrene-ethylenepropylene (S-EP) and (S-EB). The ABA structure of theKraton® rubber molecule has polystyrene endblocks and elastomericmidblocks. Examples of Kroton® are G1701, G1702, D1107, D1111, D1320available from Shell Company. It is preferred that blends of di- andtriblock copolymers are used as benefit phase structurants in thepresent invention. Gelled hydrocarbon oils using blends of di- andtriblock copolymers are commercially available from Penreco under thetradename Versagel. For example, Versagel M is a gelled mineral oilbase, Versagel ME is a gelled hydrogenated polyisobutene base, VersagelMP is a gelled isopropyl palmitate base, Versagel MC is a gelledisohexadecane base, and Versagel MD is a gelled isododecane base.

When present he benefit phase typically contains structurants in anamount of from about 0.01% to about 30%, more preferably from about 0.1%to about 20%, and more preferably still from about 1% to about 10%,based on the weight of the benefit phase.

The separate benefit phase of the striped liquid personal cleansingcompositions may optionally comprise the following skin benefitingredients for enhanced delivery of these benefit materials on skin.Preferred concentrations of optional ingredients range from about 0.1%to about 10%, more preferably from about 0.2% to about 5%, even morepreferably from about 0.5% to about 4%, by weight of the personalcleansing composition.

Suitable optional ingredients include but are not limited todesquamation actives, anti-acne actives, anti-wrinkle/anti-atrophyactives, anti-oxidants or radical scavengers, chelating agents,flavonoids, anti-inflammatory agents, anti-cellulite agents, topicalanesthetics, tanning agents, skin lightening agents, skin soothing orskin healing actives, antimicrobial actives, sunscreen actives, andsolid particulates.

The personal cleansing compositions of the present invention may furthercomprise other optional ingredients that may modify the physical,chemical, cosmetic or aesthetic characteristics of the compositions orserve as additional “active” components when deposited on the skin. Thecompositions may also further comprise optional inert ingredients. Manysuch optional ingredients are known for use in personal carecompositions, and may also be used in the personal cleansingcompositions herein, provided that such optional materials arecompatible with the essential materials described herein, or do nototherwise unduly impair product performance.

Such optional ingredients are most typically those materials approvedfor use in cosmetics and that are described in reference books such asthe CTFA Cosmetic Ingredient Handbook, Second Edition, The Cosmetic,Toiletries, and Fragrance Association, Inc. 1988, 1992. These optionalmaterials can be used in any aspect of the compositions of the presentinvention, including either of the active or cleansing phases asdescribed herein.

Optional ingredients for use in the cleansing phase of the compositionsof the present invention can include any benefit phase material asdescribed herein that is also compatible with the selected ingredientsin the cleansing phase. Likewise, optional ingredients for use in thebenefit phase of the compositions of the present invention can includeany cleansing phase material described herein that is also compatiblewith the selected ingredients in the benefit phase.

Other optional ingredients for use in either phase of the composition,preferably the benefit phase, include silicone elastomer powders andfluids to provide any of a variety of product benefits, includingimproved product stability, application cosmetics, emolliency,conditioning, and so forth. The concentration of the silicone elastomersin the composition preferably ranges from about 0.1% to about 20%, morepreferably from about 0.5% to about 10%, by weight of the composition.In this context, the weight percentages are based upon the weight of thesilicone elastomers material itself, excluding any silicone-containingfluid that typically accompanies such silicone elastomers materials inthe formulation process. The silicone elastomers suitable for optionaluse herein include emulsifying and non-emulsifying silicone elastomers,non-limiting examples of which are described in U.S. Ser. No. 09/613,266(assigned to The Procter & Gamble Company).

Density Modifiers

Just as low density microspheres can be added to the cleansing phase ofthe present invention to improve stability, high density materials canbe added to the benefit phase to increase its density having the sameimpact on stability. The high density particles employed to increase theoverall density of the benefit phase are particles having a densitygreater than 1.1 g/cm³, preferably greater than 1.5 g/cm³, morepreferably greater than 2.0 g/cm³, most preferably greater than 2.5g/cm³. The high density particles generally have a diameter less than200 μm, preferably less than 100 μm, most preferably less than 40 μm.Preferably, the high density particles are selected from water-insolubleinorganic materials, metals, metal oxides, metal alloys and mixturethereof. Non-limiting examples include calcium carbonate, silica, clays,mica, talc, iron, zinc, copper, lead, titanium dioxide, zinc oxide, andthe like.

Method of Use

The striped personal cleansing compositions of the present invention arepreferably applied topically to the desired area of the skin or hair inan amount sufficient to provide effective delivery of the skinconditioning agent to the applied surface, or to otherwise provideeffective skin conditioning benefits. The compositions can be applieddirectly to the skin or indirectly via the use of a cleansing puff,washcloth, sponge or other implement. The compositions are preferablydiluted with water prior to, during, or after topical application, andthen subsequently rinsed or wiped off of the applied surface, preferablyrinsed off of the applied surface using water or a water-insolublesubstrate in combination with water.

If the personal cleansing compositions contain stripes of varying colorsit may be desirable to package these compositions in a transparentpackage such that the consumer can view the pattern through the package.Because of the viscosity of the subject compositions it may also bedesirable to include instructions to the consumer to store the packageupside down, on its cap to facilitate dispensing.

The present invention is therefore also directed to methods of cleansingthe skin through the above-described application of the compositions ofthe present invention. The methods of the present invention are alsodirected to a method of providing effective delivery of the desired skinactive agent, and the resulting benefits from such effective delivery asdescribed herein, to the applied surface through the above-describedapplication of the compositions of the present invention.

Method of Manufacture

The personal cleansing compositions of the present invention may beprepared by any known or otherwise effective technique, suitable formaking and formulating the desired striped product form. It isespecially effective to combine toothpaste-tube filling technology witha spinning stage design. Specific non-limiting examples of such methodsas they are applied to specific embodiments of the present invention aredescribed in the following examples.

Lather Volume

Lather volume of a striped liquid personal cleansing composition ismeasured using a graduated cylinder and a tumbling apparatus. A 1,000 mlgraduated cylinder is chosen which is marked in 10 ml increments and hasa height of 14.5 inches at the 1,000 ml mark from the inside of its base(for example, Pyrex No. 2982). Distilled water (100 grams at 23° C.) isadded to the graduated cylinder. The cylinder is clamped in a rotatingdevice which clamps the cylinder with an axis of rotation that transectsthe center of the graduated cylinder. One gram of the total personalcleansing composition (0.5 g of the cleansing phase and 0.5 g of thebenefit phase) is added into the graduated cylinder and the cylinder iscapped. The cylinder is rotated at a rate of 10 revolutions in about 20seconds, and stopped in a vertical position to complete the firstrotation sequence. A timer is set to allow 30 seconds for the latherthus generated to drain. After 30 seconds of such drainage, the firstlather volume is measured to the nearest 10 ml mark by recording thelather height in ml up from the base (including any water that hasdrained to the bottom on top of which the lather is floating).

If the top surface of the lather is uneven, the lowest height at whichit is possible to see halfway across the graduated cylinder is the firstlather volume (ml). If the lather is so coarse that a single or only afew foam cells (“bubbles”) reach across the entire cylinder, the heightat which at least 10 foam cells are required to fill the space is thefirst lather volume, also in ml up from the base. Foam cells larger thanone inch in any dimension, no matter where they occur, are designated asunfilled air instead of lather. Foam that collects on the top of thegraduated cylinder but does not drain is also incorporated in themeasurement if the foam on the top is in its own continuous layer, byadding the ml of foam collected there using a ruler to measure thicknessof the layer, to the ml of foam measured up from the base. The maximumfoam height is 1,000 ml (even if the total foam height exceeds the 1,000ml mark on the graduated cylinder). One minute after the first rotationis completed, a second rotation sequence is commenced which is identicalin speed and duration to the first rotation sequence. The second lathervolume is recorded in the same manner as the first, after the same 30seconds of drainage time. A third sequence is completed and the thirdlather volume is measured in the same manner, with the same pausebetween each for drainage and taking the measurement.

The lather result after each sequence is added together and the TotalLather Volume determined as the sum of the three measurements, in ml.The Flash Lather Volume is the result after the first rotation sequenceonly, in ml, i.e., the first lather volume. Compositions according tothe present invention perform significantly better in this test thansimilar compositions in conventional emulsion form.

Density (Specific Gravity) Method

The metal pycnomoeter is utilized for determination of density (specificgravity) of both the surfactant phase and the benefit phasecompositions. One suggested type of metal pycnometer can be obtainedfrom Fisher, 3-347. Other equivalent pycnometer can also be used.Following procedure are the steps for measuring density (specificgravity) of the cleansing phase and the benefit phase compositions.

-   Step 1) Cleaning:

The metal pycnometer must be clean and dry before use. Diassemble themetal pycnometer completely and wash all parts well with water. Followthe water rinse with an alcohol rinse. Expel the alcohol with a streamof dry, clean air.

-   Step 2) Standardization

Fill the clean, dry pycnometer with distilled water at 25 C. Place thelid on body of pycnometer and screw the cap firmly in place. Dry theoutside of pycnometer well with a tissue and weigh to 0.001 g. Clean anddry the pycnometer according to the directions shown above. Assemble andweigh the dry pycnometer to 0.001 g.Water weight=Weight of pycnometer and water−weight of empty pycnometer

-   Step 3) Sample Measurement

Clean and dry the pycnometer according to the directions shown above.Allow the sample to equilibrate to room temperature. Pour the sampleinto the pycnometer, taking care to avoid introducing air into thesample in the pycnometer. Add an excess of sample so that it extendsslightly above the top of the threads. Place the lid inside the cap andscrew the cap firmly onto the body of the pycnometer. Any excess samplewill be forced through the hole in the lid of the pycnometer. Wipe awaythe excess sample carefully with a tissue. Weight the filled pycnometerto 0.001 g.Sample Weight=Weight of pycnometer and sample−weight of pycnometer.

-   Step 4) Specific Gravity=Weight of Sample/Weight of Water

The density difference between the cleansing phase and the benefit phaseis less than 0.15 g/cm³, preferably, the density difference is less than0.10 g/cm³, more preferably, the density difference is less than 0.05g/cm³, most preferably, the density difference is less than 0.01 g/cm³.

EXAMPLES

The following examples further describe and demonstrate embodimentswithin the scope of the present invention. The examples are given solelyfor the purpose of illustration and are not to be construed aslimitations of the present invention, as many variations thereof arepossible without departing from the spirit and scope of the invention.All exemplified amounts are concentrations by weight of the totalcomposition, i.e., wt/wt percentages, unless otherwise specified.

Each of the exemplified compositions provides improved deposition oreffectiveness of the skin conditioning agents or optional ingredientsdelivered from each prepared composition.

Examples 1-3

The following examples described in Table 1 are non-limiting examples ofcleansing phase and benefit phase compositions.

TABLE 1 Cleansing Phase and Benefit phase Compositions Example 1 Example2 Example 3 Ingredient wt % wt % Wt % I. Cleansing Phase CompositionAmmonium Laureth-3 Sulfate 3.0 3.0 3.0 Sodium Lauroamphoacetate 16.716.7 16.7 (Miranol L-32 Ultra from Rhodia) Ammonium Lauryl Sulfate 1.01.0 1.0 Lauric Acid 0.9 0.9 0.9 Trihydroxystearin (Thixcin R) 2.0 2.02.0 Guar Hydroxypropyltrimonium 0.17 0.75 0.75 Chloride (N-Hance 3196from Aqualon) Guar Hydroxypropyltrimonium 0.58 — — Chloride (Jaguar C-17from Rhodia) Polyquaterium 10 0.45 — — (UCARE polymer JR-30M fromAmerchol) Polymethacrylamidopropyltrimonium — 0.24 — Chloride (Polycare133 from Rhodia) Polyquaternium-39 — 0.81 — (Merqurt Plus 3300 fromCalgon) PEG 90M (Polyox WSR 301 from 0.25 — — Union Carbide) PEG-14M(Polyox WSR N-3000 H 0.45 2.45 2.45 from Union Carbide)Linoleamidoprypyl PG-Dimonium — 1.0 4.0 Chloride Phosphate Dimethicone(Monasil PLN from Uniqema) Glycerin 1.4 4.9 4.9 Sodium Chloride 0.3 0.30.3 Sodium Benzoate 0.25 0.25 0.25 Disodium EDTA 0.13 0.13 0.13 Glydant0.37 0.37 0.37 Citric Acid 1.6 0.95 0.95 Titanium Dioxide 0.5 0.5 0.5Perfume 0.5 0.5 0.5 Expancel 091 DE 40 d30 0.4 0.4 0.4 (from Expancel,Inc.) Water Q.S. Q.S. Q.S. II. Benefit phase Composition Petrolatum(SuperWhite 75 99.92 90 Protopet from WITCO) Mineral Oil (Hydrobrite1000 PO 24.92 — 9.92 White MO from WITCO) Pigment 0.08 0.08 0.08

The compositions described above can be prepared by conventionalformulation and mixing techniques. Prepare the cleansing composition 1by first creating the following premixes: citric acid in water premix at1:3 ratio, Guar polymer premix with Jaguar C-17 and N-Hance 3196 inwater at 1:10 ratio, UCARE premix with JR-30M in water at about 1:30ratio, and Polyox premix with PEG-90M and PEG-14M in Glycerin at about1:2 ratio. Then, add the following ingredients into the main mixingvessel: ammonium lauryl sulfate, ammonium laureth-3 sulfate, citric acidpremix, Miranol L-32 ultra, sodium chloride, sodium benzoate, disodiumEDTA, lauric acid, Thixcin R, Guar premix, UCARE premix, Polyox Premix,and the rest of water. Heat the vessel with agitation until it reaches190° F. (88° C.). Mix for about 10 min. Cool the batch with a cold waterbath with slow agitation until it reaches 110° F. (43° C.). Add thefollowing ingredients: Glydant, perfume, Titanium Dioxide, Expancel.Keep mixing until a homogeneous solution forms.

Prepare the cleansing composition 2 by first creating the followingpremixes: citric acid in water premix at 1:3 ratio, Guar polymer premixwith N-Hance 3196 in water at 1:10 ratio, and Polyox premix with PEG-14Min Glycerin at about 1:2 ratio. Then, add the following ingredients intothe main mixing vessel: ammonium lauryl sulfate, ammonium laureth-3sulfate, citric acid premix, Miranol L-32 ultra, sodium chloride, sodiumbenzoate, disodium EDTA, lauric acid, Thixcin R, Guar premix, PolyoxPremix, Polycare 133, Merquat Plus 3300, Monosil PLN, and the rest ofwater. Heat the vessel with agitation until it reaches 190° F. (88° C.).Mix for about 10 min. Cool the batch with a cold water bath with slowagitation until it reaches 110° F. (43° C.). Add the followingingredients: Glydant, perfume, Titanium Dioxide, Expancel. Keep mixinguntil a homogeneous solution forms.

Prepare the cleansing composition 3 by first creating the followingpremixes: citric acid in water premix at 1:3 ratio, Guar polymer premixwith N-Hance 3196 in water at 1:10 ratio, and Polyox premix with PEG-14Min Glycerin at about 1:2 ratio. Then, add the following ingredients intothe main mixing vessel: ammonium lauryl sulfate, ammonium laureth-3sulfate, citric acid premix, Miranol L-32 ultra, sodium chloride, sodiumbenzoate, disodium EDTA, lauric acid, Thixcin R, Guar premix, PolyoxPremix, Monasil PLN, and the rest of water. Heat the vessel withagitation until it reaches 190° F. (88° C.). Mix for about 10 min. Coolthe batch with a cold water bath with slow agitation until it reaches110° F. (43° C.). Add the following ingredients: Glydant, perfume,Titanium Dioxide, Expancel. Mix until a homogeneous solution forms.

Prepare the benefit phase, add petrolatum into a mixing vessel. Heat thevessel to 140° F. (60° C.). Then, add mineral oil and cosmetic pigmentwith agitation. Let the vessel cool down with slow agitation.

The cleansing and benefit phases are density matched to within 0.05g/cm³. Package both phases into a single container using conventionaltoothpaste-tube filler equipment. The sample stage spins the bottleduring the filling process to create a striped appearance. The stripesize is about 6 mm in width and 100 mm in length.

Examples 4-6

The following examples described in Table 2 are non-limiting examples ofcleansing phase and benefit phase compositions of the present invention.

TABLE 2 Cleansing Phase and Benefit phase Compositions Example 4 Example5 Example 6 Ingredient wt % wt % wt % I. Cleansing Phase CompositionMiracare SLB-365 (from Rhodia) 47.4 47.4 47.4 (Sodium Trideceth Sulfate,Sodium Lauramphoacetate, Cocamide MEA) Polyquaterium 10 (UCare KG-30M)0.7 — — Jaguar C-17 (from Rhodia) 0.7 Guar Hydroxypropyltrimonium — —0.7 Chloride (N-Hance 3196 from Aqualon) PEG 90M (Polyox WSR 301 from —— 0.2 Dow Chemical) Sodium Chloride 3.5 3.5 3.5 Disodium EDTA 0.05 0.050.05 Glydant 0.67 0.67 0.67 Citric Acid 0.4 0.4 0.4 Perfume 2.0 2.0 2.0Expancel 091 DE 40 d30 0.4 0.4 0.4 (from Expancel, Inc.) Water Q.S. Q.S.Q.S. (pH) (6.0) (6.0) (6.0) II. Benefit phase Composition Petrolatum(Superwhite Protopet 75 75 75 from WITCO) Bentone Gel MIO (from Rheox)24.92 — — Mineral Oil (Hydrobrite 1000 PO — 23.92 23.92 White MO fromWITCO) Kraton G1702 (from Shell) — 1 — Claytone HY (from Southern Clay)— — 1 Colorona Magenta Cosmetic Pigment 0.08 0.08 0.08 (from Rona)

Prepare the compositions described above by conventional formulation andmixing techniques. Prepare the cleansing phase composition by firstadding citric acid into water at 1:3 ratio to form a citric acid premix.Then, add the following ingredients into the main mixing vessel in thefollowing sequence: water, Miracare SLB-365, sodium chloride, sodiumbenzoate, Disodium EDTA, glydant. Start agitation of the main mixingvessel. In a separate mixing vessel, disperse polymers (Polyquaterium10, Jaguar C-17, or N-Hance 3196) in water at 1:10 ratio and form apolymer premix. Add the completely dispersed polymer premix into themain mixing vessel with continuous agitation. Disperse Polyox WSR 301 inwaterl and then add to the main mixing vessel. Then, add the rest of thewater, perfume, and Expancel into the batch. Keep agitation until ahomogenous solution forms.

Prepare the benefit phase by adding petrolatum into a mixing vessel.Heat the vessel to 190° F. Then, add mineral oil, Bentone Gel, Kratonpolymer, or Claytone HY with agitation. High shear the samplescontaining Bentone Gel or Claytone. Add cosmetic pigment and let thevessel cool down with slow agitation.

The cleansing and benefit phases are density matched to within 0.05g/cm³. Package both phases into a single container using conventionaltoothpaste-tube filler equipment. The sample stage spins the bottleduring filling process to create a striped appearance. The stripe sizeis about 6 mm in width and 100 mm in length.

Examples 7-9

The following examples described in Table 3 are non-limiting examples ofcleansing phase and benefit phase compositions of the present invention.

TABLE 3 Cleansing Phase and Benefit phase Compositions Example 7 Example8 Example 9 Ingredient wt % wt % wt % I. Cleansing Phase CompositionMiracare SLB-365 (from Rhodia) 47.4 47.4 47.4 (Sodium Trideceth Sulfate,Sodium Lauramphoacetate, Cocamide MEA) Sodium Chloride 3.5 3.5 3.5Disodium EDTA 0.05 0.05 0.05 Glydant 0.67 0.67 0.67 Citric Acid 0.4 0.40.4 Perfume 2.0 2.0 2.0 Expancel 091 DE40 d30 0.4 0.4 0.4 (fromExpancel, Inc.) Water Q.S. Q.S. Q.S. (pH) (6.0) (6.0) (6.0) II. Benefitphase Composition Versagel M500 (Gelled Mineral 99.92 — — Oil fromPenreco) Versagel MC1600 (Gelled isoparaffin — 99.92 — From Penreco)Versagel ME500 (Gelled — — 99.92 hydrogenated polyisobutene fromPenreco)) Colorona Magenta Cosmetic Pigment 0.08 0.08 0.08 (from Rona)

The compositions described above can be prepared by conventionalformulation and mixing techniques. Prepare the cleansing phasecomposition by first adding citric acid into water at 1:3 ratio to forma citric acid premix. Then, add the following ingredients into the mainmixing vessel in the following sequence: water, Miracare SLB-365, sodiumchloride, sodium benzoate, Disodium EDTA, glydant. Start agitation ofthe main mixing vessel. Then, add perfume into the batch. Keep agitationuntil a homogenous solution forms.

Prepare the benefit phase by adding Versagel into a mixing vessel. Heatthe vessel to 190° F. Then, add cosmetic pigment with agitation. Let thevessel cool down with slow agitation.

The cleansing and benefit phases are density matched within 0.05 g/cm³.Package both phases into a single container using conventionaltoothpaste-tube filler equipment. The sample stage spins the bottleduring the filling process to create a striped appearance. The stripesize is about 6 mm in width and 100 mm in length.

The dimensions and values disclosed herein are not to be understood asbeing strictly limited to the exact numerical values recited. Instead,unless otherwise specified, each such dimension is intended to mean boththe recited value and a functionally equivalent range surrounding thatvalue. For example, a dimension disclosed as “40 mm” is intended to mean“about 40 mm.”

All documents cited in the Detailed Description of the Invention are, inrelevant part, incorporated herein by reference; the citation of anydocument is not to be construed as an admission that it is prior artwith respect to the present invention.

While particular embodiments of the present invention have beenillustrated and described, it would be obvious to those skilled in theart that various other changes and modifications can be made withoutdeparting from the spirit and scope of the invention. It is thereforeintended to cover in the appended claims all such changes andmodifications that are within the scope of this invention.

What is claimed is:
 1. A personal cleansing article comprising: (a) atleast one cleansing phase stripe comprising (i) a surfactant; (ii) anelectrolyte comprising an anion selected from the group consisting ofphosphate, chloride, sulfate, citrate and mixtures thereof; (iii) acation selected from the group consisting of sodium, ammonium,potassium, magnesium and mixtures thereof; (iv) water; and (v) a densitymodifier comprising a low density microsphere; and (b) at least onebenefit phase stripe comprising at least about 20% by weight of ahydrophobic skin benefit agent having a Vaughan Solubility Parameter offrom about 5 to about 15 (cal/cm³) ^(0.5), the benefit phasesubstantially free of surfactant and substantially anhydrous; whereinthe cleansing phase stripe and the benefit phase stripe have essentiallythe same density.
 2. A personal cleansing article according to claim 1wherein said low density microsphere comprises a particle having adensity lower than 0.7 g/cm³.
 3. A personal cleansing article accordingto claim 1 wherein said low density microsphere is selected from thegroup consisting of inorganic material, organic material and mixturesthereof.
 4. A personal cleansing article according to claim 1, whereinthe benefit phase has a consistency value of from about 1 poise to about10,000 poise.
 5. A personal cleansing article according to claim 1,wherein the benefit phase has a Shear Index of from about 0.1 to about0.8.
 6. A personal cleansing article according to claim 1, wherein thehydrophobic skin benefit agent represents at least about 50% by weightof the benefit phase.
 7. A personal cleansing article according to claim1, wherein at least 20% by weight of the benefit phase is selected fromthe group consisting of petrolatum, mineral oil micro-crystalline waxes,paraffins, ozokerite, polyethylene, polybutene, polydecene andperhydrosqualene, dimethicones, cyclomethicones, alkyl siloxanes,polymethylsiloxanes and methylphenylpolysiloxanes, lanolin, lanolin oil,lanolin wax, lanolin alcohols, lanolin fatty acids, isopropyl lanolate,acetylated lanolin, acetylated lanolin alcohols, lanolin alcohollinoleate, lanolin alcohol riconoleate castor oil, soy bean oil,sunflower seed oil, maleated soy bean oil, safflower oil, cotton seedoil, corn oil, walnut oil, peanut oil, olive oil, cod liver oil, almondoil, avocado oil, palm oil and sesame oil, and combinations thereof. 8.A personal cleansing article according to claim 1, wherein the benefitphase comprises a structurant.
 9. A personal cleansing article accordingto claim 8 wherein the structurant is selected from the group consistingof trihydroxystearin, silicas, clays, and polymers.
 10. A personalcleansing article according to claim 1 further comprising a cationicdeposition polymer.
 11. A personal cleansing article according to claim1 wherein the at least one cleansing phase stripe and the at least onebenefit phase stripe form a pattern within the package.
 12. A personalcleansing article according to claim 1 wherein said package istransparent.